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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '871389dfb28f8ef0b7fe75a9df9b20b84a78f0d83a037c5ab49da1a0299ca14f' 
  AND token = 'mTKK/Y+vMbSS8iaDha4sKxqkE8ifM7Mpr7t3Js2LKLU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}